delete pics to save space

history_source/信息学奥赛一本通/2.5.8.cpp

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+#include<cstdio>
+#include<cstring>
+#define xMax 10
+#define yMax 10
+int Map[xMax+1][yMax+1],xs,ys,ans=0;
+int dx[]={-2,-1, 1, 2,2,1,-1,-2},
+	dy[]={-1,-2,-2,-1,1,2, 2, 1};
+bool check(int x,int y)
+{
+	if((x<0||x>=xs)||(y<0||y>=ys)||(Map[x][y]>0)) return 0;
+	return 1;
+}
+void dfs(int x,int y,int step)
+{
+	if(step>=xs*ys){ans++;return;}
+	for(int i=0;i<8;i++)
+		if(check(x+dx[i],y+dy[i]))
+		{
+			Map[x+dx[i]][y+dy[i]]=step+1;
+			dfs(x+dx[i],y+dy[i],step+1);
+			Map[x+dx[i]][y+dy[i]]=0;
+		}
+}
+int main()
+{
+	int t;
+	int x,y;
+	scanf("%d",&t);
+	int answer[t];
+	for(int i=0;i<t;i++)
+	{
+		scanf("%d%d%d%d",&xs,&ys,&x,&y);
+		memset(Map,ans=0,sizeof(Map));
+		dfs(x,y,Map[x][y]=1);
+		answer[i]=ans;
+	}
+	for(int i=0;i<t;i++) printf("%d\n",answer[i]);
+	return 0;
+}